Paper-sheet.



Patented Mar. '25, I902.

No. 696,28l.

' A. H. TUOLE.

-PAPER SHEET.

(Application filed Dec. 30, 1901.)

(No Model.)

'ATTORNE Ys.

- 1 m: mumps PETEflS 00.. PHOTO-LITHQ, WASHINGTON. o. c,

UNrTED STATES PATENT OFFICE.

AUGUSTUS I-IARRY'TOOLE, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TOCHARLES ARTHUR BURTON, OF CHICAGO, ILLINOIS.

PAPER SHEET.

SPECIFICATION forming part of Letters Patent No. 696,281, dated March25, 1902. Application filed December so. 1901. Serial no; 87,790.. onspecimens.)

To aZZ whom it may concern:

Be it known that I, AUGUSTUS HARRY TOOLE, a citizen of the United Statesof America, and aresident of Chicago, county of Cook, and State ofIllinois, have invented certain new and usefullmprovements in PaperSheets, of which the following is a specification. 7

My improvement is designed mainly for loose-leaf ledger-sheets in whichit'is desirable that a part extending near to and parallel with thebinding edge of each sheet be made more flexible than the body of thesheet. 7 The purpose of this is to cause the main parts of the sheets tolie flat upon each other when the book is opened. This has beenaccomplished heretofore by milling away part of the surface of eachsheet on several lines extending near to and parallel with the bindingedge or by creasing or'scoring the paper on such lines. The milled lineswhen properly made have been generally regarded as superior to scored orcreased lines. The proper milling of suchlines, however, requires veryaccurate machinery and is a comparatively slow and expensive process.

The main object of my invention is to produce improved sheets of theclass described and to render same more flexible or weaken same at thedesired parts by a method which is quicker and cheaper than the millingprocess and more efficient than the method of scoring or creasing. Iaccomplish these objects by the process hereinafter described and theproduct illustrated in the accompanying drawings, in which- Figure 1 isa perspective view of a looseleaf ledger made according to my invention.Fig. 2 is a plan of one of the sheets from which said ledger isconstructed.

In putting my invention into practice I rule the sheetslwith a pluralityof lines 2 on one face of the sheet and with similarlines 3 on theopposite face of the sheet. The lines 2 and 3 are arranged alternately.All of said lines extend along the binding edge a of the sheet andpreferably have one end terminating a short distance inward of the upperedge 5 of said sheet and have the other end terminating a short distanceinward of the lower edge 6 of said sheet. Each of said lines is ruledwith a corrosive liquid coming' in contact with the fibers of the sheetto a considerable depth of the paper, but not affecting the fibers ofsaid paper throughout its entire thickness along said line. i V

The corrosive liquid used may be made of sufficient strength to destroythe fibers with which same comes in contact; but I prefer to use a weaksolution which in itself is not strong enough to destroy the fibersunder ordinary atmospheric temperature. I have used a weak solution ofsulfuric acid for this purpose; but it is plain that many othercorrosive liquids maybe used with similar efiect. In thus treating thepaper I first rule the lines with the corrosive liquid and then bringthe sheets of paper thus ruled into contact with a heated roll or othersuitable surface of sufficiently high temperature to carbonize ordestroy the fibers with which said liquid has been brought in contact,but ofinsufficient temperature to carbonize or render brittle the otherparts of the sheet.

In the drawings, 7 represents the casing or frame of the binding, and 8represents metallic binding-teeth acting through the apertures 9, withwhich each of the sheets is provided. The binding and frame shown inFig. 1 is merely one of many different forms of devices used for bindingtogether the sheets of loose-leaf ledgers. In order to have the sheetslie flat upon each other, it is necessary to weaken same along the lines2 or at the part of the sheets adjacent to their binding edges. By mymethod of destroying or carbonizing some of the fibers of the paperalong the lines 2 and 3 it will be seen that the paper isrenderedwcakerand readily bendable fore do not confine myself to the detailsmen- I parallel lines extending along the binding tioned except ashereinafter limited in the claims.

\Vhat I claim as my invention, and desire to secure by Letters Patent,is

1. As an article of manufacture, a sheet of book-paper having a lineextending along thebinding edge of said sheet and ruled with a corrosiveliquid, for the purpose specified.

2. As an article of manufacture, a sheet of book-paper having aplurality of substantially parallel lines extending along the bindingedge of said sheet and ruled with a corrosive liquid, for the purposespecified.

3. As an article of manufacture, a sheet of book-paper having a plurality of substantially parallel lines extending along the binding edgeof the sheet on each face thereof and ruled with a corrosive liquid,said lines being alternately arranged on the opposite faces of thesheet, for the purpose specified.

4. As an article of manufacture, a sheet of book-paper having a lineextending along the binding edge of said sheet and ruled with acorrosive liquid, said line having one end t'erminating a short distanceinward of the upper edge of said sheet, and the other end'terminating ashort distance inward of the'lower edge of said sheet, for the purposespecified.

5. As an article of manufacture, a sheet of book-paper having aplurality of substantially edge of said sheet and ruled with a corrosiveliquid, each of said lines having one end terminating a short distanceinward of the upper edge of said sheet, and the other end terminating ashort distance inward of the lower edge of said sheet, for the purposespecified.

6. As an article of manufacture, a sheet of book-paper having aplurality of substantially parallel lines extending along the bindingedge of the sheet on each face thereof and ruled with a corrosiveliquid, said lines being alternately arranged on the opposite faces ofthe sheet, each of said lines having one end terminating a shortdistance inward of the upper edge of said sheet, and the other endterminating 'a short distance inward of the lower edge of said sheet,for the purpose specified.

7. A book comprising a plurality of sheets of paper each having a lineextending along its binding edge, and ruled with a corrosive liquid,said lines being substantially equidistant from said binding edges, forthe purpose specified.

'Signed at Chicago this 28th day of December, 1901.

AUGUSTUS HARRY TOOLE. Witnesses:

WM. It. RUMMLER, EUGENE A. RUMMLER.

